Center and axis indicator.



H. JUBINVILLE.

CENTER AND AXIS INDICATOR. APPLICATION FILED 05c. 16, 1912.

1,141,396. Patented June 1, 1915.

WITNESSES INVE TQR: @M M BY W 4 ATTORNEY.

HILDAIGE JUBINVILLE, 0F IDEACUT, MASSACHUSETTS.

CENTER AND AXIS INDICATOR.

Specification of Letters Patent.

Patented June 1, 1915.

Application filed. December 16, 1912. Serial No. 736,951.

To all whom it may concern Be it known that I, HILDAIGE JUBINVILLE, acitizen of the United States, residing at Dracut, in the county ofMiddlesex and Commonwealth of Massachusetts, have invented a certain newand useful Improvement in Center and Axis Indicators, of which thefollowing is aspecification.

This invention relates to center and axis indicators and may be used inconnection with lathes, horizontal and upright drilling, and boringmachines, and with any machine or tool in which it is desired todetermine the alinement of a revolving center with a stationary centeror with a point in stationary or dead work, as in the former case todetermine the truth or'exact alinement with each other of the centers ofa lathe or similar machine-tool, and in the lat ter to iiX the properposition of the work to be operated upon.

The objects of this invention are to provide a light, portable device,with few parts and joints, of great accuracy, and of wide application.

The only essential movable parts in this device are the indicator needleand its holding ball, the movable reinforcing ring being used to securelightness and strength, and not being indispensable as its use may beavoided by increasing the stifiness of the shell or body.

Figure 1 is an isometri'c'perspective view of my improved center andaxis indicator; Fig. 2, a central longitudinal section of the same; Fig.3, a vertical transverse section on the line 3 3 in Fig. 2 showing thedisk; Fig. 4, a central longitudinal section oi the ball, its securingsleeve and nut, and the sleeve with double female center showing a partof the needle; Fig. 5 a side elevation of the device held in a revolvingchuck and indicating the alinement of the centers; Fig. 6, a sideelevation of the head of the device applied to dead or non-revolvingwork.

A is a tubular shellor case provided with lateral sight openings at andmay be a hard brass tube in which the sight-openings are punched. Theends of the case A are closed by plugs B B one B of which is providedwith a shank b adapted to be held in a chuck C of a lathe or othermachine-tool having a revolving spindle D to carry said chuck. Thisshank may be hollowed as shown at b for lightness. The other plug B isprovided with a central socket to receive a ball E and allow the latterto turn freely in any direction.

The ball E carries an'indicating needle or pointer F which passesthrough a central opening 6 in said ball, and extends nearly intocontact with an indicator disk (i marked as shown in Fig. 3 with acentral spot 9 and circles g g g *on'centric with said spot 9 The disk Gis crowded into place by the plug and may be held in place by friction;

The outer, larger end f or" the needle F projects from the ball and isshaped to enter and lit closely a female center H of sixty degrees, thecenter proper of which is adapted to receive the dead center of a latheor other inachinedool, as shown in Fig. 5. it is obvious that when theshank- 5 is has held in a revolving chuck "J carried by the live spindleand the socket engages the dead spindle, as above described the innerend or point of the needle F will be in alinement with the central spot9 of the disk G, if the aXis of the two centers of the lathe are inalinement with each other, but that if the centers are out of alinement,the point of the needle will describe a circle and that by adjusting oneof these centers, if possible, until the needle points directly to thespot 9, the centers will be brought into alinement. Usually, suchadjustment is impossible. If the point of the needle points steadily inthe 7 same direction but not to the spot it indicates that the deadcenter is out of alinement with the headstock on thedia1netricallyopposite side of the spot 9 from that indicated by theneedle. if the live spindle describes a circle,.the point of the needlewill also describe a circle, the radius of which will be proportionateto the distance the live center is out of true. it is also apparent thatif a piece of work be placed in the lathe or similar machinetool and thefemale center H be removed and the outer end of the needle (which is acenter of siiity degrees) be placed in a prick punch hole in the workand the live spindle be revolved, the needle will show by pointing tothe spot 9 that the work is properly centered, or otherwise will show bvdescribing a circle about said spot that the head stock is out of true,but, if the circle described is eccentric to said spot the work must bemoved to secure the proper alinement of the chuck and prick punch hole.

To facilitate Watching the point of the needle, as when the needle isused point up, an annular mirror I is arranged at right angles to theaxis of the tubular body A,

in which mirror the movement of the needle point relatively to the diskG, isclearly reflected. I

ward against said ball by a spiral spring f compressed between said balland a nut 7, said spring being preferably guided by a depression 6 insaid ball. The outer end of the sleeve 7 is slightly tapered and isprovided with a longitudinal slit 7", so that turning said nut onto saidsleeve binds said sleeve and needle together and normally holds theflange 7' against said ball but allows the needle to be crowded nearlyinto contact with the disk G when in use, to fa cilitate observation ofthe concentricity or eccentricity of the needle point with said disk. e

i To strengthen and stiffen the narrow, longitudinal parts a of theshell or case A between the sight openings a, an annular reinforce orring J is retained by friction between these parts at right angles tothe axis of said case but may be moved toward either end of said case tofacilitate observation of the disk G or mirror I.

I claim as my invention:

1. The combination in a center and axis indicator, of means adapted tobe grasped by and turned with a revolving holder, a pointer carried bysaid means and free to turn in all directions about a fixed center, anda disk carried by said means and having concentric circles and a centralspot markedthereon, said spot being in alinement with said center ofsaid pointer and with the center of rotation of said holder.

2. The combination in a center and axis indicator of a case providedwith sightopenings and with a closed end, having a socket, a ball freetoturn in all'directions in said socket, a pointer passing through saidball and closed end and a disk located spot being in alinement with theaxis of ro-,

tation of said case and with the center of said ball.

3. The combination in a center .and axis indicator of a case providedwith sightopenings and with a closed end, having a socket, a ball freeto turn in all directions in said socket, a pointer passing through thecenter of said ball and 'being free to move longitudinally in said ball,a disk arranged in said case and having concentric circles and a centralspot market thereon, said spot.

being in alinement with said'center of said pointer and with the center01": said ball, and elastic means for pressing said needle away fromsaid disk.

4:- The combination in a center and axis indicator, of a case providedwith sightopenings and witha closed end and'having 5. The combination ina center and axis indicator, of a case provided with sightopenings andhaving a socket, a ball free to turn in all directions in said socket, apointer passing through said ball and projecting from said ball and,socket, a disk located in said case andhaving concentric circles and acentral spot marked thereon, said spot-beingin alinement with the centerof said pointer, and a female center adapted to be secured on saidprojecting end of said pointer.

6. The combination in a center and axis 7 indicator, of acaseprovidedwith longitudinal sightppenings and with a closed end and havinga socket, a ball free to turn in all dll'QCtlOl'iS in said socket,- apointer passing through said ball, aidisklocated in said case and havingconcentric circles and a central spot marked thereon, and an annularreinforce retained by friction on said case and movable toward eitherend of said case.

In witness whereof, I have aiiixed my signature in presence oftwo-witnesses.

HILDAI GE JUBINVILLE.

Witnesses: Y

ALBERT M. Moons, GEORGE WOLFGANG.

copies of this patent may be obtained for five cents each by addressinge Commissioner of Patents,

Washington, D. 0. I

